LibOverride: Fix several issues with resync code.

This commit essentially touches to post-processing of collections and
objects after resync itself has been done, to ensure their proper
instantiation in the scene:

 - Remove a lot of the process in resync case (resynced data are assumed
   to be already instantiated in the scene, unlike override creation
   case).

 - For auto-resync, only do post-processing once after all overrides
   have been resynced (doing it after each individual resynced was
   causing a lot of instantiation glitches, with a lot of unwanted
   extra objects and collections being added to the master collection).

It also deals in a much more reliable way with detection of objects
missing from the scene, by using the new `BKE_scene_objects_as_gset`
utils.

As a bonus this makes auto-resync process slightly faster (only by a few
percents, but that's always good to get).

1 files changed, 1 insertions, 1 deletions

diff --git a/source/blender/editors/space_outliner/outliner_tools.c b/source/blender/editors/space_outliner/outliner_tools.c
index 66eb6ab15dc..4159074df9c 100644
--- a/source/blender/editors/space_outliner/outliner_tools.c
+++ b/source/blender/editors/space_outliner/outliner_tools.c
@@ -925,7 +925,7 @@ static void id_override_library_resync_fn(bContext *C,
     }
 
     BKE_lib_override_library_resync(
-        bmain, scene, CTX_data_view_layer(C), id_root, NULL, do_hierarchy_enforce);
+        bmain, scene, CTX_data_view_layer(C), id_root, NULL, do_hierarchy_enforce, true);
 
     WM_event_add_notifier(C, NC_WINDOW, NULL);
   }